ls = [1, 2, 3, 4]
# --- 不生成新的列表 ----
ls.append(5)
print("append: ", ls)

ls.extend(list(range(6, 10)))
print("extend: ", ls)

ls.insert(len(ls), 10)
print("insert: ", ls)

# --- 会生成新的列表 ----
ls2 = ls + [11, 12, 13]
print("+ 运算符：", ls2, ls)

ls3 = ls * 2
print("* 运算符：", ls3, ls)
